Adding button to group header

[Avi]

Hello,

I created a Group:

<telerik:RadGridView Grid.Row="4" Grid.Column="1" Margin="0,5" ItemsSource="{Binding MatchedReferences}">
    <telerik:RadGridView.GroupHeaderTemplate>
        <DataTemplate>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="100"/>
                    <ColumnDefinition Width="60"/>
                </Grid.ColumnDefinitions>
                <TextBlock Foreground="#1044AD" Text="{Binding Group.Key}"/>
                <telerik:RadButton Grid.Column="1" x:Name="DeleteButton2" Height="20"
                Command="{Binding DeleteMatchCommand}"
                Content="{Binding AppStrings.Delete, Source={StaticResource StringsLocator}}">
                </telerik:RadButton>
            </Grid>
        </DataTemplate>
    </telerik:RadGridView.GroupHeaderTemplate>
    ...

    <telerik:RadGridView.Columns>
        ...
        <telerik:GridViewDataColumn DataMemberBinding="{Binding MatchId}" IsVisible="False"/>
    </telerik:RadGridView.Columns>
    <telerik:RadGridView.GroupDescriptors>
        <telerik:GroupDescriptor Member="MatchId" />
    </telerik:RadGridView.GroupDescriptors>

public RelayCommand<string> DeleteMatchCommand { get; protected set; }

DeleteMatchCommand = new RelayCommand<string>((matchId) => ExecuteDelete(matchId));

private void ExecuteDelete(string matchId)
{
}

But the problem is that by clicking the "delete" button the ExecuteDelete event has NOT been fired. When I put the "delete" button outside of GroupHeaderTemplateand and click in at runtime  there's no problem. the event is fired and the  ExecuteDelete method is executed. Why is this?

With regards